--- old/test/jdk/java/nio/channels/unixdomain/UnixDomainSocketAddressSerializationTest.java	2020-07-02 17:52:59.000000000 +0100
+++ new/test/jdk/java/nio/channels/unixdomain/UnixDomainSocketAddressSerializationTest.java	2020-07-02 17:52:59.000000000 +0100
@@ -25,15 +25,19 @@
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
 import java.io.IOException;
+import java.io.InvalidObjectException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
+import java.io.ObjectStreamClass;
 import java.io.Serializable;
 import java.nio.channels.UnixDomainSocketAddress;
 import java.nio.file.Path;
-
+import static java.io.ObjectStreamConstants.*;
 import static org.testng.Assert.assertEquals;
 import static org.testng.Assert.assertTrue;
+import static org.testng.Assert.expectThrows;
 
 /*
  * @test
@@ -60,6 +64,13 @@
         assertEquals(deserialized, addr);
     }
 
+    static final Class<InvalidObjectException> IOE = InvalidObjectException.class;
+
+    /** Tests that UnixDomainSocketAddress in the byte-stream is disallowed. */
+    public static void testUnixDomainSocketAddressInStream() {
+        expectThrows(IOE, () -> deserialize(byteStream(), UnixDomainSocketAddress.class));
+    }
+
     private static <T extends Serializable> byte[] serialize(T t)
             throws IOException {
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
@@ -78,4 +89,28 @@
             return cl.cast(o);
         }
     }
+
+    static final String CLASSNAME = UnixDomainSocketAddress.class.getName();
+    static final long SUID = ObjectStreamClass.lookup(UnixDomainSocketAddress.class).getSerialVersionUID();
+    /**
+     * Returns a stream with UnixDomainSocketAddress in the stream. The
+     * stream will have no stream field values.
+     */
+    static byte[] byteStream() throws Exception {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        DataOutputStream dos = new DataOutputStream(baos);
+        dos.writeShort(STREAM_MAGIC);
+        dos.writeShort(STREAM_VERSION);
+        dos.writeByte(TC_OBJECT);
+        dos.writeByte(TC_CLASSDESC);
+        dos.writeUTF(CLASSNAME);
+        dos.writeLong(SUID);
+        dos.writeByte(SC_SERIALIZABLE);
+        dos.writeShort(0);                // number of stream fields
+        dos.writeByte(TC_ENDBLOCKDATA);   // no annotations
+        dos.writeByte(TC_NULL);           // no superclasses
+        dos.write(TC_ENDBLOCKDATA);       // end block - for SC_WRITE_METHOD
+        dos.close();
+        return baos.toByteArray();
+    }
 }